Olympic champion Alexander Zverev has welcomed an ATP investigation into domestic violence claims from his ex-girlfriend because it will allow him to prove his innocence. The ATP said on Monday it had launched a probe after the German’s former partner, Russian Olga Sharypova, alleged that during their relationship he was physically abusive towards her, including at the 2019 Shanghai Masters event. Zverev, 24, has denied wrong-doing and protested his innocence again at the Indian Wells Masters where the men’s first round starts later on Thursday. After training on Wednesday at the Californian v…